#!/bin/sh
#
#  +----------------------------------------------------------------------+
#  | Copyright (c) The PHP Group                                          |
#  +----------------------------------------------------------------------+
#  | This source file is subject to version 3.01 of the PHP license,      |
#  | that is bundled with this package in the file LICENSE, and is        |
#  | available through the world-wide-web at the following url:           |
#  | https://php.net/license/3_01.txt                                     |
#  | If you did not receive a copy of the PHP license and are unable to   |
#  | obtain it through the world-wide-web, please send a note to          |
#  | license@php.net so we can mail you a copy immediately.               |
#  +----------------------------------------------------------------------+
#  | Authors: Sascha Schumann <sascha@schumann.cx>                        |
#  +----------------------------------------------------------------------+
#
# This script generates PHP lexer and parser files required to build PHP. The
# generated files are ignored in the Git repository and packaged during the PHP
# release process into the release installation archive download. This way the
# bison and re2c dependencies are not required to build PHP when downloading
# release archive.
#
# Usage: genfiles
#
# Environment:
#   The following environment variables can override default generators paths.
#
#     YACC    Parser generator program, default bison
#     RE2C    Lexer generator program, default re2c
#     SED     Path to sed program, default sed
#     MAKE    Path to make program, default make
#
#   For example:
#     YACC=/path/to/bison ./genfiles

YACC=${YACC:-bison}
YACC="$YACC -l"
RE2C=${RE2C:-re2c}
RE2C_FLAGS="-i"
SED=${SED:-sed}
MAKE=${MAKE:-make}

# Go to project root.
cd $(CDPATH= cd -- "$(dirname -- "$0")/../../" && pwd -P)

# Check required bison version from the configure.ac file.
required_bison_version=$($SED -n 's/PHP_PROG_BISON(\[\([0-9\.]*\)\].*/\1/p' configure.ac)
set -f; IFS='.'; set -- $required_bison_version; set +f; IFS=' '
required_bison_num="$(expr ${1:-0} \* 10000 + ${2:-0} \* 100 + ${3:-0})"

current_version=$($YACC --version 2> /dev/null | grep 'GNU Bison' | cut -d ' ' -f 4 | tr -d a-z)
set -f; IFS='.'; set -- $current_version; set +f; IFS=' '
current_bison_num="$(expr ${1:-0} \* 10000 + ${2:-0} \* 100 + ${3:-0})"

if test -z "$current_version"; then
  echo "genfiles: bison not found." >&2
  echo "          You need bison version $required_bison_version or newer installed" >&2
  echo "          to regenerate parser files." >&2
  exit 1
fi

if test "$current_bison_num" -lt "$required_bison_num"; then
  echo "genfiles: bison version $current_version found." >&2
  echo "          You need bison version $required_bison_version or newer installed" >&2
  echo "          to build parser files." >&2
  exit 1
else
  echo "genfiles: bison version $current_version (ok)"
fi

# Check required re2c version from the configure.ac file.
required_re2c_version=$($SED -n 's/PHP_PROG_RE2C(\[\(.*\)\])/\1/p' configure.ac)
set -f; IFS='.'; set -- $required_re2c_version; set +f; IFS=' '
required_re2c_num="$(expr ${1:-0} \* 10000 + ${2:-0} \* 100 + ${3:-0})"

current_version="$($RE2C --version | cut -d ' ' -f 2  2>/dev/null)"
set -f; IFS='.'; set -- $current_version; set +f; IFS=' '
current_re2c_num="$(expr ${1:-0} \* 10000 + ${2:-0} \* 100 + ${3:-0})"

if test -z "$current_version"; then
  echo "genfiles: re2c not found." >&2
  echo "          You need re2c version $required_re2c_version or newer installed" >&2
  echo "          to regenerate lexer files." >&2
  exit 1
fi

if test "$current_re2c_num" -lt "$required_re2c_num"; then
  echo "genfiles: re2c version $current_version found." >&2
  echo "          You need re2c version $required_re2c_version or newer installed" >&2
  echo "          to build lexer files." >&2
  exit 1
else
  echo "genfiles: re2c version $current_version (ok)"
fi

# Check if make exists.
if ! test -x "$(command -v $MAKE)"; then
  echo "genfiles: make not found. Please install make to generate files." >&2
  exit 1
fi

echo "genfiles: Generating Zend parser and lexer files"
$MAKE RE2C="$RE2C" RE2C_FLAGS="$RE2C_FLAGS" YACC="$YACC" SED="$SED" srcdir=Zend builddir=Zend top_srcdir=. \
  -f Zend/Makefile.frag \
  Zend/zend_language_parser.c \
  Zend/zend_language_scanner.c \
  Zend/zend_ini_parser.c \
  Zend/zend_ini_scanner.c

echo "genfiles: Generating phpdbg parser and lexer files"
$MAKE RE2C="$RE2C" RE2C_FLAGS="$RE2C_FLAGS" YACC="$YACC" srcdir=sapi/phpdbg builddir=sapi/phpdbg top_srcdir=. \
  -f sapi/phpdbg/Makefile.frag \
  sapi/phpdbg/phpdbg_parser.c \
  sapi/phpdbg/phpdbg_lexer.c

echo "genfiles: Generating json extension parser and lexer files"
$MAKE RE2C="$RE2C" RE2C_FLAGS="$RE2C_FLAGS" YACC="$YACC" srcdir=ext/json builddir=ext/json top_srcdir=. \
  -f ext/json/Makefile.frag \
  ext/json/json_parser.tab.c \
  ext/json/json_scanner.c

echo "genfiles: Generating PDO lexer file"
$MAKE RE2C="$RE2C" RE2C_FLAGS="$RE2C_FLAGS" srcdir=ext/pdo builddir=ext/pdo top_srcdir=. \
  -f ext/pdo/Makefile.frag \
  ext/pdo/pdo_sql_parser.c

echo "genfiles: Generating standard extension lexer files"
$MAKE RE2C="$RE2C" RE2C_FLAGS="$RE2C_FLAGS" srcdir=ext/standard builddir=ext/standard top_srcdir=. \
  -f ext/standard/Makefile.frag \
  ext/standard/var_unserializer.c \
  ext/standard/url_scanner_ex.c

echo "genfiles: Generating phar extension lexer file"
$MAKE RE2C="$RE2C" RE2C_FLAGS="$RE2C_FLAGS" srcdir=ext/phar builddir=ext/phar top_srcdir=. \
  -f ext/phar/Makefile.frag \
  ext/phar/phar_path_check.c
